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This patch enables rounding of the profile icons in the Mac's people
menu to align with the GM2 circular icons used elsewhere in Chrome.
This is achieved by applying a circular mask to the image and
increasing the resolution of the avatar icons requested.

This CL also avoid a call to AvatarMenu::GetImageForMenuButton() and
calls GetAvatarIcon() directly (the additional logic of
GetImageForMenuButton() is not needed here).

Bug: 857064
Change-Id: I1444dc6081f3af6289be7fa6a886153a70c9ecf6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2517059
Commit-Queue: Jan Krcal <jkrcal@chromium.org>
Auto-Submit: Jan Krcal <jkrcal@chromium.org>
Reviewed-by: Thomas Lukaszewicz <tluk@chromium.org>
Reviewed-by: David Roger <droger@chromium.org>
Cr-Commit-Position: refs/heads/master@{#825957}